<?php
namespace app\system\controller;

use app\system\model\DatabaseModel;

class Database extends Common
{

    public function _initialize()
    {
        parent::_initialize();
        set_time_limit(0);
    }

    public function index()
    {
        $path = config('db.DATA_BACKUP_PATH');
        if(!is_dir($path)){
            mkdir($path, 0755, true);
        }

        $path = realpath($path);
        $flag = \FilesystemIterator::KEY_AS_FILENAME;
        $glob = new \FilesystemIterator($path,  $flag);

        $list = array();
        foreach ($glob as $name => $file) {

            if(preg_match('/^\d{8,8}-\d{6,6}-\d+\.sql(?:\.gz)?$/', $name)){
                $title=$name;
                $name = sscanf($name, '%4s%2s%2s-%2s%2s%2s-%d');

                $date = "{$name[0]}-{$name[1]}-{$name[2]}";
                $time = "{$name[3]}:{$name[4]}:{$name[5]}";
                $part = $name[6];

                if(isset($list["{$date} {$time}"])){
                    $info = $list["{$date} {$time}"];
                    $info['part'] = max($info['part'], $part);
                    $info['size'] = $info['size'] + $file->getSize();
                } else {
                    $info['part'] = $part;
                    $info['size'] = $file->getSize();
                }
                $info['title']=$title;
                $extension        = strtoupper(pathinfo($file->getFilename(), PATHINFO_EXTENSION));
                $info['compress'] = ($extension === 'SQL') ? '-' : $extension;
                $info['time']     = strtotime("{$date} {$time}");

                $list["{$date} {$time}"] = $info;
            }
        }

        $assign = [
            'list' => array_reverse($list)
        ];


        return $this->fetch('', $assign);
    }

    /*
     * 添加备份
     */
    public function add()
    {
        $databaseModel    = new DatabaseModel();
        $list  = $databaseModel->querySql('SHOW TABLE STATUS');
        $list  = array_map('array_change_key_case', $list);

        $this->assign('list', $list);
        return $this->fetch();
    }


    /**
     * 备份数据库
     * @param String  $tables 表名
     * @param Integer $id     表ID
     * @param Integer $start  起始行数
     * @return \think\response\Json
     */
    public function export($tables = null, $id = null, $start = null)
    {
        if(request()->isPost() && !empty($tables) && is_array($tables)){ //初始化
            $path = config('db.DATA_BACKUP_PATH');
            if(!is_dir($path)){
                mkdir($path, 0755, true);
            }
            //读取备份配置
            $config = [
                'path'     => realpath($path) . DIRECTORY_SEPARATOR,
                'part'     => config('db.DATA_BACKUP_PART_SIZE'),
                'compress' => config('db.DATA_BACKUP_COMPRESS'),
                'level'    => config('db.DATA_BACKUP_COMPRESS_LEVEL'),
            ];

            //检查是否有正在执行的任务
            $lock = "{$config['path']}backup.lock";
            if(is_file($lock)){
                return $this->jsonError('检测到有一个备份任务正在执行，请稍后再试！');
            } else {
                //创建锁文件
                file_put_contents($lock, time());
            }

            //检查备份目录是否可写
            is_writeable($config['path']) || $this->error('备份目录不存在或不可写，请检查后重试！');
            session('backup_config', $config);

            //生成备份文件信息
            $file = [
                'name' => date('Ymd-His', time()),
                'part' => 1,
            ];
            session('backup_file', $file);

            //缓存要备份的表
            session('backup_tables', $tables);

            //创建备份文件
            $Database = new \app\common\controller\Database($file, $config);
            if(false !== $Database->create()){
                $tab = ['id' => 0, 'start' => 0];
                return $this->jsonSuccess('初始化成功！', ['tables' => $tables, 'tab' => $tab]);
            } else {
                return $this->jsonError('初始化失败，备份文件创建失败！');
            }
        } elseif (request()->isGet() && is_numeric($id) && is_numeric($start)) { //备份数据
            $tables = session('backup_tables');
            //备份指定表
            $Database = new \app\common\controller\Database(session('backup_file'), session('backup_config'));
            dump($Database);die;
            $start  = $Database->backup($tables[$id], $start);
            if(false === $start){ //出错
                return $this->jsonError('备份出错！');
            } elseif (0 === $start) { //下一表
                if(isset($tables[++$id])){
                    $tab = ['id' => $id, 'start' => 0];
                    return $this->jsonSuccess('备份完成！', ['tab' => $tab]);
                } else { //备份完成，清空缓存
                    unlink(session('backup_config.path') . 'backup.lock');
                    session('backup_tables', null);
                    session('backup_file', null);
                    session('backup_config', null);
                    return $this->jsonSuccess('备份完成！');
                }
            } else {
                $tab  = ['id' => $id, 'start' => $start[0]];
                $rate = floor(100 * ($start[0] / $start[1]));
                return $this->jsonSuccess("正在备份...({$rate}%)", ['tab' => $tab]);
            }

        } else { //出错
            return $this->jsonError('参数错误！');
        }
    }

    /**
     * 优化表
     * @param String $tables 表名
     * @return \think\response\Json
     * @throws \think\db\exception\BindParamException
     * @throws \think\exception\PDOException
     */
    public function optimize($tables = null)
    {
        if($tables) {
            $databaseModel = new DatabaseModel();
            if(is_array($tables)){
                $tables = implode('`,`', $tables);
                $list = $databaseModel->executeSql("OPTIMIZE TABLE `{$tables}`");

                if($list){
                    return $this->jsonSuccess("数据表优化完成！");
                } else {
                    return $this->jsonError("数据表优化出错请重试！");
                }
            } else {
                $list = $list = $databaseModel->executeSql("OPTIMIZE TABLE `{$tables}`");
                if($list){
                    return $this->jsonSuccess("数据表'{$tables}'优化完成！");
                } else {
                    return $this->jsonError("数据表'{$tables}'优化出错请重试！");
                }
            }
        } else {
            return $this->jsonError("请指定要优化的表！");
        }
    }

    /**
     * 修复表
     * @param String $tables 表名
     * @return \think\response\Json
     * @throws \think\db\exception\BindParamException
     * @throws \think\exception\PDOException
     */
    public function repair($tables = null){
        if($tables) {
            $databaseModel = new DatabaseModel();
            if(is_array($tables)){
                $tables = implode('`,`', $tables);
                $list = $databaseModel->executeSql("REPAIR TABLE `{$tables}`");

                if($list){
                    return $this->jsonSuccess("数据表修复完成！");
                } else {
                    return $this->jsonError("数据表修复出错请重试！");
                }
            } else {
                $list = $databaseModel->executeSql("REPAIR TABLE `{$tables}`");
                if($list){
                    return $this->jsonSuccess("数据表'{$tables}'修复完成！");
                } else {
                    return $this->jsonError("数据表'{$tables}'修复出错请重试！");
                }
            }
        } else {
            return $this->jsonError("请指定要修复的表！");
        }
    }

    /**
     * 删除备份文件
     * @param integer $time 备份时间
     * @return \think\response\Json
     */
    public function del($id=0){
        $time = trim($id);
        if($time){
            $name  = date('Ymd-His', $time) . '-*.sql*';
            $path  = realpath(config('db.DATA_BACKUP_PATH')) . DIRECTORY_SEPARATOR . $name;
            array_map("unlink", glob($path));
            if(count(glob($path))){
                return $this->jsonError('备份文件删除失败，请检查权限！');
            } else {
                return $this->jsonSuccess('备份文件删除成功');
            }
        } else {
            return $this->jsonError('参数错误！');
        }
    }

    /**
     * 还原数据库
     * @param int $time
     * @param mixed $part
     * @param mixed $start
     * @return \think\response\Json
     */
    public function import($time = 0, $part = null, $start = null){
        if(is_numeric($time) && is_null($part) && is_null($start)){ //初始化
            //获取备份文件信息
            $name  = date('Ymd-His', $time) . '-*.sql*';
            $path  = realpath(config('db.DATA_BACKUP_PATH')) . DIRECTORY_SEPARATOR . $name;
            $files = glob($path);
            $list  = array();
            foreach($files as $name){
                $basename = basename($name);
                $match    = sscanf($basename, '%4s%2s%2s-%2s%2s%2s-%d');
                $gz       = preg_match('/^\d{8,8}-\d{6,6}-\d+\.sql.gz$/', $basename);
                $list[$match[6]] = [$match[6], $name, $gz];
            }
            ksort($list);

            //检测文件正确性
            $last = end($list);
            if(count($list) === $last[0]){
                session('backup_list', $list); //缓存备份列表
                return $this->jsonSuccess('正在还原数据库，请不要关闭网页...', ['part' => 1, 'start' => 0]);
            } else {
                return $this->jsonError('备份文件可能已经损坏，请检查！');
            }
        } elseif(is_numeric($part) && is_numeric($start)) {
            $list  = session('backup_list');
            $db = new \app\common\controller\Database($list[$part], array(
                'path'     => realpath(config('db.DATA_BACKUP_PATH')) . DIRECTORY_SEPARATOR,
                'compress' => $list[$part][2]));

            $start = $db->import($start);

            if(false === $start){
                return $this->jsonError('还原数据出错！');
            } elseif(0 === $start) { //下一卷
                if(isset($list[++$part])){
                    $data = ['part' => $part, 'start' => 0];
                    return $this->jsonSuccess("正在还原...#{$part}", $data);
                } else {
                    session('backup_list', null);
                    return $this->jsonSuccess('还原完成！');
                }
            } else {
                $data = ['part' => $part, 'start' => $start[0]];
                if($start[1]){
                    $rate = floor(100 * ($start[0] / $start[1]));
                    return $this->jsonSuccess("正在还原...#{$part} ({$rate}%)", $data);
                } else {
                    $data['gz'] = 1;
                    return $this->jsonSuccess("正在还原...#{$part}", $data);
                }
            }

        } else {
            return $this->jsonError('参数错误！');
        }
    }
}
